Use this fluid to calibrate your pH electrode. This is, along with the 7.00 pH solution, the most commonly used fluid to calibrate your electrode for monitoring pH levels in your aquarium. If you want...

Use this fluid to calibrate your pH electrode. This is, along with the 7.00 pH, the most commonly used fluid to calibrate your electrode for monitoring the pH value in your aquarium. If you want...

This Magnetic Electrode Holder features a strong magnet and is made of durable plastic. The magnetic electrode holder is resistant to seawater, impacts, and shocks. This electrode holder can accommodate up to 4 electrodes and is equipped with powerful...

This fluid is required if you want to monitor low pH values, such as in a calcium reactor. Do not use this fluid if you intend to use the electrode for aquarium water, for which...

This calibration fluid is designed to calibrate the conductivity probe for use in reverse osmosis water. If you want to monitor the quality of your saltwater, you will need this 53 mS fluid.

REAL-TIME MONITORING OF DISSOLVED OXYGEN IS A GREAT SAFETY NET Many marine aquarists only give the oxygen content in their aquarium water a passing thought, not fully understanding how the level of the Dissolved Oxygen...

The Neptune Systems ORP / Redox Electrode - Double Junction is an electrode that allows you to monitor ORP, replace your ORP electrode, or add one for another tank. The probe measures ORP in your aquarium with...

The Neptune Systems pH Electrode - Double Junction is an extra durable and accurate pH electrode. Replace your pH probe or add another for a different tank, calcium reactor, etc. It is recommended to purchase this probe...

The conductivity electrode is suitable for measuring the salt content in the water. You purchase this electrode when an old electrode needs to be replaced. It is also suitable for measuring the salt content of the water,...

The Neptune Systems Dissolved Oxygen Module monitors real-time dissolved oxygen levels in your aquarium. Of all the organisms in your aquarium, large fish are at the greatest risk when O2 levels are low. In some situations, a...

The Neptune Systems Advanced Sensor Module allows you to connect hundreds of different types of future Neptune Systems and current sensors to your Apex and log their data. Sensors such as a PAR sensor can, for example,...

Enhance your aquarium experience with the MXM Module! The MXM is an advanced module that seamlessly connects local wireless communication platforms used with Neptune APEX, EcoTech, and AquaIllumination equipment. This module offers a range of...

If you have pumps like those from Tunze that can be controlled with a 0-10V port, then this VDM module is definitely for you! You can control up to 4 pumps simultaneously with this Variable Speed Pump module. Simply...

Do you want to better mimic the natural environment of your aquarium inhabitants? You can do this with the LSM module from Neptune Systems. Moonlight is considered as important as daylight. Moonlight activates internal and external biological...

The DOS is a multifunctional dosing and fluid dispensing system. The DOS connects to any Apex via its AquaBus connection. The true versatility and functionality of the DOS comes to life through the software wizards built into Apex Fusion. This takes...

Real-time monitoring of salinity levels in the aquarium. This is possible with the Salinity PM2 module from Neptune Systems. Keeping salinity levels constant and at the right level is very important for the well-being of all organisms...

4-in-1 with this handy module! The PM1 module gives you the ability to measure pH and Redox/ORP in your aquarium. And, as a bonus, you get an extra temperature port and an I/O port to...

The Neptune Systems Fluid Monitoring Module is a multifunctional module that allows your Apex, using various Apex accessories, to detect leaks and water levels. The module also monitors flow and provides power to Neptune Systems accessories. The FMM has...

This I/O Breakout Box can be connected to your Apex or a PM module, giving you the ability to use up to six external switches in your system. It's easy to connect to your Neptune equipment. The I/O...

The IceCap Gyre Interface Module is an after-market product that will allow you to hook up your Maxspect Gyre pump to most 3rd party controllers by using an available 0-10 volt port. This makes the...